Hello,
please feel free to use this program to fix the project file:
http://www.digitalschnitt.de/Support/cust/PremProPatch_keyframe.h-error.zip
There are two versions, the 64bit is for very large project.
The 32bit worked with a project file of e.g. 270MB; bigger files can crash this version.
Drag and drop your damaged project file on the program and it will generate a new file with a "_corrected_by_mik.prproj" extension. Try to open the new file.
This program will only fix the project, not the problem on your PC.
Mit freundlichen Grüßen
Michael Schleider
Service und Support
magic multi media GmbH
Edit by Kevin Monahan
Personal details removed.